Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tinh voi » trinh voi, tinh doi, binh voi
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
nam luc » nang luc, nhan luc, nam thuc
tinh vi » trinh vi, tinh va, dinh vi
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te tai ((ky lang) OR (ky dang)) xa hoi. hieu van nam luc va ((tinh vi) or (tinh voi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te tai ((ky lang) OR (ky dang)) xa hoi. hieu van nam luc va ((tinh vi) OR (tinh voi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te tai ((ky lang) OR (ky dang)) xa hoi. hieu van nam luc va ((tinh vi) or (tinh voi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te tai ((ky lang) OR (ky dang)) xa hoi. hieu van nam luc va ((tinh vi) or (tinh voi)) cua tre*.